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What is Timer?

Timer is a clock that controls the sequence of an event while counting in fixed intervals of time. A Timer is used for producing precise time delay. Secondly, it can be used to repeat or initiate an action after/at a known period of time. This feature is very commonly used in several applications. An example could be setting up an alarm which triggers at a point of time or after a period of time.
 
Most of the processors/controllers have inbuilt Timers. Timers in a processor/controller not only generate time delays but they can also be used as counters. They are used to count an action or event. The value of counter increases by one, every time its corresponding action or event occurs. Timers in a processor/controller are inbuilt chips that are controlled by special function registers (SFRs) assigned for Timer operations.  

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